Antenna Structure With Coupling Element For SAR Control
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Solution Overview
Problem
Existing antenna structures face challenges in achieving high radiation efficiency while maintaining a Specific Absorption Rate (SAR) below recommended limits, especially in hybrid devices like 2-in-1 laptops, where the antenna performance is compromised in tablet mode and SAR values are excessively high due to the presence of grounding capacitors that affect detection distance.
Innovation Solution
The proposed antenna system incorporates a substrate with a radiation element, a coupling element, a grounding element, a feeding element, and a conducting element, where the coupling element and coupling portion are separated and coupled to each other, and the feeding element is connected between the coupling element and the grounding element to optimize signal feeding, while an inductor is integrated with a proximity sensor circuit to detect capacitance and adjust emission power, thereby controlling SAR levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If grounding capacitors are added between the feeding terminal and transceiver for proximity detection, then the detection function is provided, but the antenna performance is adversely affected and detection distance is reduced
Solution Approach 1:
The patent divides the grounding function from the detection function by using a separate detection capacitor connected between the radiation element and ground, rather than placing capacitors in the feeding path. This segmentation allows the antenna to maintain its primary radiation function while providing proximity detection through capacitance changes.
Solution Approach 2:
The patent introduces a separate detection capacitor as an intermediary element that couples the radiation element to ground for detection purposes only. This intermediary capacitor enables proximity sensing without interfering with the main feeding path and antenna radiation performance.
2Measurement precision
If antenna efficiency is improved by reducing detection distance, then the detection accuracy is enhanced, but the SAR value becomes excessively high
Solution Approach 1:
The patent implements a feedback mechanism where the proximity sensor circuit continuously monitors capacitance changes and provides control signals to adjust the transmission power. When proximity is detected, the system reduces power to maintain SAR within safe limits while preserving detection accuracy through the separate capacitive sensing path.
Solution Approach 2:
The patent makes the transmission power dynamic by adjusting it based on detected proximity conditions. The system transitions between different power states (high power when no proximity, reduced power when proximity detected) to maintain both detection accuracy and safe SAR levels.
3Productivity
If the coupling element is physically connected to the coupling portion, then the signal transmission is direct, but the impedance matching and frequency tuning flexibility is reduced
Solution Approach 1:
The patent introduces a coupling capacitor as an intermediary element between the coupling portion and coupling element, enabling signal transmission while providing impedance transformation and frequency tuning capability. This capacitor acts as a mediator that maintains signal efficiency while adding adaptability.
Solution Approach 2:
The patent utilizes the capacitance value as a variable parameter to control impedance matching and frequency response. By adjusting the coupling capacitor value, the system can optimize both signal transmission efficiency and impedance matching for different operating conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances antenna performance while ensuring SAR values remain within safe limits, even when a user is close to the device, by optimizing the bandwidth and frequency bands and adjusting impedance matching to maintain efficient signal transmission.
Implementation Method 1
a first radiation portion for providing a first operating band, a second radiation portion for providing a second operating band
Implementation Method 2
The coupling element and the coupling portion are separated from each other and coupling to each other
Implementation Method 3
The radiation element is a sensing electrode and the proximity sensor circuit detects a capacitance value through the sensing electrode
Data Source
AI summary
The instant disclosure provides an antenna system and an antenna structure thereof. The antenna structure includes a substrate, a radiation element, a coupling element, a grounding element, a conducting element, and a feeding element. The radiation element is disposed on the substrate and includes a first radiation portion for providing a first operating band, a second radiation portion for providing a second operating band, and a coupling portion connected between the first and the second radiation portion. The coupling element is disposed on the substrate. The coupling element and the coupling portion are separated from each other and coupling to each other. The feeding element is coupled between the coupling element and the grounding element and for feeding a signal. The conducting element is used to transmit a signal to the grounding element.